[Coco] CoCo I 26-3004A and "fix"

[rietveld rietveld]

I just saw your pic.    My white coco1 also looks like it has the fix‎

Sent from my BlackBerry Passport Red Edition.
  Original Message  
From: Oswaldo Aquique
Sent: Sunday, January 7, 2018 11:03 PM
To: CoCoList for Color Computer Enthusiasts
Reply To: CoCoList for Color Computer Enthusiasts
Subject: Re: [Coco] CoCo I 26-3004A and "fix"

Thanks!

I also found a picture of a white CoCo I and the motherboard has the same fix.

Cheers,
Oswaldo

Sent from my iPhone

> On Jan 7, 2018, at 7:11 PM, Bruce W. Calkins <brucewcalkins at charter.net> wrote:
> 
> There is a model number printed near the cartridge port on the board. Early CoCo 1s had a "B", "C", "D", or "E" at the end of the number. "F" boards ended in a 283 IIRC.
> 
> I had 2 "F" board CoCos, one with the fix that worked OK and one without that would lock up after running a while.
> 
> Bruce W.
> 
> 
>> On 01/07/2018 10:00 PM, Oswaldo Aquique wrote:
>> Thanks!
>> 
>> Not sure where to look if this is a "F" board, but did surprise me when opened my CoCo I
>> 
>> Sent from my iPhone
>> 
>>> On Jan 7, 2018, at 6:55 PM, Bruce W. Calkins <brucewcalkins at charter.net> wrote:
>>> 
>>> That looks like the infamous "F" (283?) board timing fix.
>>> 
>>> Bruce W.
>>> 
>>> 
>>> 
>>>> On 01/07/2018 08:48 PM, Oswaldo Aquique wrote:
>>>> Hi,
>>>> In preparation to attempt the CoCo I composite output circuit, I opened the CoCo 1 I recently purchased (26-3004A, 64K) and found it has a “patch” or “fix” in the motherboard.
>>>> 
>>>> Just curious about what this is for. Has anyone seen something like this?
>>>> 
>>>> I have posted a couple of pictures at https://1drv.ms/f/s!Au1yAYzNT_IAgbS1BqEB2Is4PcYmUO0
>>>> 
>>>> It seems I’ll need to relocate this fix if I want to play with the 1372
>>>> 
>>>> Thanks,
>>>> Oswaldo
>>>> 
>>>> Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10
>>>> 
>>>> 
>>>> 
> 
> 
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